There are three categories of mixtures, including solutions, suspensions, colloids, and mixtures containing at least two different substances: liquids, gases, or solids. Solutions are the most straightforward mixture, where two substances intermingle and have small particles.
A solution is a homogeneous combination where a solid or solute is dissolved into another substance referred to as the solvent. The act of one compound dissolving in another compound is known as solubility.
An example of a gas solution would be air, a solution consisting of oxygen and nitrogen and a few other gases. Seawater is an excellent example of a simple solution, and it is just water and salt. A perfect example of solid solutions would be very abundant silicates. A good example would be the igneous rock, which is a combination of several elements formed by heat and pressure.